Getting Errors…

I was getting excited for this one, but I’m getting 2 warnings and one fatal error in the options screen:

Environment:

Windows 7 Pro, WordPress 5.11, Xampp running php 7.2, The site health plugin activated or not, the errors are happening.
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Warning: include(C:\xampp\htdocs\acf58/wp-admin/includes/class-wp-site-health.php): failed to open stream: No such file or directory in C:\xampp\htdocs\acf58\wp-content\plugins\site-health-tool-manager\site-health-tool-manager.php on line 63

Warning: include(): Failed opening ‘C:\xampp\htdocs\acf58/wp-admin/includes/class-wp-site-health.php’ for inclusion (include_path=’C:\xampp\php\PEAR’) in C:\xampp\htdocs\acf58\wp-content\plugins\site-health-tool-manager\site-health-tool-manager.php on line 63

Fatal error: Uncaught Error: Class ‘WP_Site_Health’ not found in C:\xampp\htdocs\acf58\wp-content\plugins\site-health-tool-manager\site-health-tool-manager.php:64 Stack trace: #0 C:\xampp\htdocs\acf58\wp-includes\class-wp-hook.php(286): shtm_settings_page(”) #1 C:\xampp\htdocs\acf58\wp-includes\class-wp-hook.php(310): WP_Hook->apply_filters(”, Array) #2 C:\xampp\htdocs\acf58\wp-includes\plugin.php(465): WP_Hook->do_action(Array) #3 C:\xampp\htdocs\acf58\wp-admin\admin.php(253): do_action(‘settings_page_s…’) #4 C:\xampp\htdocs\acf58\wp-admin\options-general.php(10): require_once(‘C:\\xampp\\htdocs…’) #5 {main} thrown in C:\xampp\htdocs\acf58\wp-content\plugins\site-health-tool-manager\site-health-tool-manager.php on line 64

Thanks.